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Responses of Calves Fed Diets Supplemented with Different Sources of Nitrogen and with Volatile Fatty Acids

Department of Animal Science, University of Minnesota, St. Paul

ABSTRACT

Responses of young calves to starters containing supplements as follows: (I) soybean meal (44%), (II) soybean meal and branched-chain volatile fatty acids, (III) urea, and (IV) urea and branched-chain volatile fatty acids were studied. Calf starters and high quality alfalfa hay were fed ad libitum. Calves fed starters containing supplements of soybean meal (I and II) gained faster (P < 0.01) than those consuming starters containing supplements of urea (III and IV). The addition of the volatile fatty acid mixture had no effect on weight gains (P > 0.05). Hay consumption and concentrate consumption among groups were not different (P > 0.05). Molar proportions of rumen volatile fatty acids were not different even though branched-chain acids were fed to two of the groups.

¹ Trainee under USPHS, graduate training in Nutrition Grant No. GM 01401.

² Present address: Animal Husbandry Research Division, Beltsville, Maryland.